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<h1>navo/algorithm/crypto/symmetric/tea.c</h1>  </div>
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<a href="tea_8c.html">浏览该文件的文档。</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */</span>
<a name="l00011"></a>00011 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#pragma optimize(&quot;t&quot;, on)</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#endif  </span><span class="comment">/* #ifdef _MSC_VER */</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;<a class="code" href="tea_8h.html" title="TEA.">tea.h</a>&quot;</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include &quot;<a class="code" href="endian_8h.html" title="Definitions for byte order.">../../../port/endian.h</a>&quot;</span>
<a name="l00017"></a>00017 
<a name="l00018"></a>00018 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00020"></a>00020 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00021"></a>00021 
<a name="l00022"></a><a class="code" href="group__TEA.html#gaa86c31302c66ffbff07ab81f3c449ae2">00022</a> NV_IMPL <span class="keywordtype">void</span> <a class="code" href="group__TEA.html#gaa86c31302c66ffbff07ab81f3c449ae2" title="设置TEA密钥">tea_set_key</a>(<a class="code" href="structtea__key.html" title="TEA密钥">tea_key</a>* key, <span class="keywordtype">void</span>* src_key)
<a name="l00023"></a>00023 {
<a name="l00024"></a>00024     uint32_t* pkey = (uint32_t*)src_key;
<a name="l00025"></a>00025     key-&gt;<a class="code" href="structtea__key.html#a66950ff8726c260e005423c9aeefad74" title="密钥">sk</a>[0] = __le32_to_cpu(pkey[0]);
<a name="l00026"></a>00026     key-&gt;<a class="code" href="structtea__key.html#a66950ff8726c260e005423c9aeefad74" title="密钥">sk</a>[1] = __le32_to_cpu(pkey[1]);
<a name="l00027"></a>00027     key-&gt;<a class="code" href="structtea__key.html#a66950ff8726c260e005423c9aeefad74" title="密钥">sk</a>[2] = __le32_to_cpu(pkey[2]);
<a name="l00028"></a>00028     key-&gt;<a class="code" href="structtea__key.html#a66950ff8726c260e005423c9aeefad74" title="密钥">sk</a>[3] = __le32_to_cpu(pkey[3]);
<a name="l00029"></a>00029 }
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 NV_IMPL <span class="keywordtype">void</span> __tea_encrypt(uint32_t* sk, uint32_t* dst, uint32_t* src)
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033     uint32_t n = 32;
<a name="l00034"></a>00034     uint32_t sum = 0;
<a name="l00035"></a>00035 
<a name="l00036"></a>00036     uint32_t y = __le32_to_cpu(src[0]);
<a name="l00037"></a>00037     uint32_t z = __le32_to_cpu(src[1]);
<a name="l00038"></a>00038 
<a name="l00039"></a>00039     uint32_t k0 = sk[0];
<a name="l00040"></a>00040     uint32_t k1 = sk[1];
<a name="l00041"></a>00041     uint32_t k2 = sk[2];
<a name="l00042"></a>00042     uint32_t k3 = sk[3];
<a name="l00043"></a>00043 
<a name="l00044"></a>00044     <span class="keywordflow">while</span> (n--) {
<a name="l00045"></a>00045         sum += 0x9E3779B9UL;
<a name="l00046"></a>00046         y += ((z &lt;&lt; 4) + k0) ^ (z + sum) ^ ((z &gt;&gt; 5) + k1);
<a name="l00047"></a>00047         z += ((y &lt;&lt; 4) + k2) ^ (y + sum) ^ ((y &gt;&gt; 5) + k3);
<a name="l00048"></a>00048     }
<a name="l00049"></a>00049 
<a name="l00050"></a>00050     dst[0] = __cpu_to_le32(y);
<a name="l00051"></a>00051     dst[1] = __cpu_to_le32(z);
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 
<a name="l00054"></a>00054 NV_IMPL <span class="keywordtype">void</span> __tea_decrypt(uint32_t* sk, uint32_t* dst, uint32_t* src)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056     <span class="keywordtype">int</span> n = 32;
<a name="l00057"></a>00057     uint32_t sum = 0xC6EF3720UL;
<a name="l00058"></a>00058 
<a name="l00059"></a>00059     uint32_t y = __le32_to_cpu(src[0]);
<a name="l00060"></a>00060     uint32_t z = __le32_to_cpu(src[1]);
<a name="l00061"></a>00061 
<a name="l00062"></a>00062     uint32_t k0 = sk[0];
<a name="l00063"></a>00063     uint32_t k1 = sk[1];
<a name="l00064"></a>00064     uint32_t k2 = sk[2];
<a name="l00065"></a>00065     uint32_t k3 = sk[3];
<a name="l00066"></a>00066 
<a name="l00067"></a>00067     <span class="keywordflow">while</span> (n--) {
<a name="l00068"></a>00068         z -= ((y &lt;&lt; 4) + k2) ^ (y + sum) ^ ((y &gt;&gt; 5) + k3);
<a name="l00069"></a>00069         y -= ((z &lt;&lt; 4) + k0) ^ (z + sum) ^ ((z &gt;&gt; 5) + k1);
<a name="l00070"></a>00070         sum -= 0x9E3779B9UL;
<a name="l00071"></a>00071     }
<a name="l00072"></a>00072 
<a name="l00073"></a>00073     dst[0] = __cpu_to_le32(y);
<a name="l00074"></a>00074     dst[1] = __cpu_to_le32(z);
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 NV_IMPL <span class="keywordtype">void</span> __xtea_encrypt(uint32_t* sk, uint32_t* dst, uint32_t* src)
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079     uint32_t sum = 0;
<a name="l00080"></a>00080 
<a name="l00081"></a>00081     uint32_t y = __le32_to_cpu(src[0]);
<a name="l00082"></a>00082     uint32_t z = __le32_to_cpu(src[1]);
<a name="l00083"></a>00083 
<a name="l00084"></a>00084     <span class="keywordflow">while</span> (sum != 0xC6EF3720UL) {
<a name="l00085"></a>00085         y += ((((z &lt;&lt; 4) ^ (z &gt;&gt; 5)) + z) ^ (sum + sk[sum &amp; 3]));
<a name="l00086"></a>00086         sum += 0x9E3779B9UL;
<a name="l00087"></a>00087         z += ((((y &lt;&lt; 4) ^ (y &gt;&gt; 5)) + y) ^ (sum + sk[(sum &gt;&gt; 11) &amp; 3]));
<a name="l00088"></a>00088     }
<a name="l00089"></a>00089 
<a name="l00090"></a>00090     dst[0] = __cpu_to_le32(y);
<a name="l00091"></a>00091     dst[1] = __cpu_to_le32(z);
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093 
<a name="l00094"></a>00094 NV_IMPL <span class="keywordtype">void</span> __xtea_decrypt(uint32_t* sk, uint32_t* dst, uint32_t* src)
<a name="l00095"></a>00095 {
<a name="l00096"></a>00096     uint32_t sum = 0xC6EF3720UL;
<a name="l00097"></a>00097 
<a name="l00098"></a>00098     uint32_t y = __le32_to_cpu(src[0]);
<a name="l00099"></a>00099     uint32_t z = __le32_to_cpu(src[1]);
<a name="l00100"></a>00100 
<a name="l00101"></a>00101     <span class="keywordflow">while</span> (sum) {
<a name="l00102"></a>00102         z -= ((((y &lt;&lt; 4) ^ (y &gt;&gt; 5)) + y) ^ (sum + sk[(sum &gt;&gt; 11) &amp; 3]));
<a name="l00103"></a>00103         sum -= 0x9E3779B9UL;
<a name="l00104"></a>00104         y -= ((((z &lt;&lt; 4) ^ (z &gt;&gt; 5)) + z) ^ (sum + sk[sum &amp; 3]));
<a name="l00105"></a>00105     }
<a name="l00106"></a>00106 
<a name="l00107"></a>00107     dst[0] = __cpu_to_le32(y);
<a name="l00108"></a>00108     dst[1] = __cpu_to_le32(z);
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110 
<a name="l00111"></a>00111 
<a name="l00112"></a>00112 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span>}
<a name="l00114"></a>00114 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00115"></a>00115 
<a name="l00116"></a>00116 
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